Advanced Zinc Phosphate Conversion and Pre-Ceramic Polymetallosiloxane Coatings for Corrosion Protection of Steel and Aluminum, and Characteristics of Polyphenyletheretherketone-Based Materials.

摘要

The characteristics of anhydrous zinc phosphate (Zn.Ph) coatings deposited by immersing the steel in transition Co, Ni, and Mn cation-incorporated phosphating solutions were investigated. Two important features for the anhydrous 340 deg C-heated Zn.Ph were addressed. One was to determine if the electron trapping behavior of Co2+ and Ni2+ ions adsorbed in the crystal lattices acts to inhibit the cathodic reaction on the Zn.Ph, and the second was to determine the less susceptibility of the a-Zn3(PO4)2 phase to alkali-induced dissolution. The factors governing the film-forming performance of preceramic polymetallosiloxane (PMS) coatings for aluminum (Al) substrate surfaces were investigated. Four factors were important in obtaining a good film: (1) the formation of organopolymetallosiloxane at sintering temperatures of 150 deg C; (2) the pyrolytic conversion at 350 deg C into an amorphous PMS network structure in which the Si-O-M linkage were moderately enhanced; (3) the non-crystalline phases; and (4) the formation of interfacial oxane bond between PMS and Al oxide. The formation of well-crystallized polyphenyletheretherketone (PEEK) in the vicinity of silica aggregates was found in the molted body made in N2. Such a PEEK crystalline structure contributed significantly to the thermal and hydrothermal stabilities of mortar specimens at temperatures up to 200 deg C, and the resistance in 5 wt% H2S04 solution at 80 deg C. anhydrous zinc phosphate, steel, corrosion, polymetallosiloxane, aluminum, polyphenyletheretherketone.